Negative ion field desorption mass spectrometry (NFD MS) has been applied to some nucleotides. Polyethylene glycol (PEG 4000) was used as a matrix to facilitate the ion formation at low field strengths and temperatures. Molecular ions of mononucleotides could be obtained with no or a low level of fragmentation. In contrast, NFD mass spectra of dinucleotides and a mononucleotide triphosphate did not exhibit molecular ions but only fragment ions.
M SUBHAN ,F W ROELLGEN ,NOOR AHMAD ,
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